Joseph iierrburger



(No Model.)

J. HERRBURGER.

GRAND PIANO.

Patented Nov. 10, 1896.

UNITED STATES PATENT OFFICE.

JOSEPH IIERRBURG-ER, OF PARIS, FRANCE.

GRAND PIANO.

SPECIFICATION forming part of Letters Patent No. 571,163, dated November10, 1896.

Application filed August 15, 1896. Serial No. 602,848. (No model.)

To (LZZ whom it may concern.-

Be it known that I, JOSEPH IIERRBURGER, of Paris, France, have inventedan Improved Action for Grand Pianos, of which the following is aspecification.

This invention relates to an action for grand pianos which embracesvarious features of novelty, and has for its object to avoid frictionbetween the repeating-lever and the hanini erbutt-regulating screw, toprovide a guide for the repeating-lever, and to obtain a superior springaction for such lever and the jack.

In the accompanying drawings, Figure 1 is a side elevation of myimproved action for grand pianos. Fig. 2 is a cross-section 011 line 22, Fig. 1.

The letter a represents the rider of a grandpiano action pivotallyconnected to rail a by flange a Z) is the jack; 0, the hammer-shank; d,the ha1n1ner-butt,and ethe butt-regulating screw.

The repeating-lever f is pivoted directly to the rider a, as at f, andis not made straight as heretofore, but is curved or bulged out wardly,so that its convex upper side reaches beneath thehanimer. By means ofthis curved shape of the lever f I obtain, 1noreover,aspace for a posth, that projects upwardly from the rider Ct between the lever and thejack. This post is provided with a screw-hole that receives the end of aregulating-screw 1', which extends through a bushed slot f of lever fand carries the punchings or washers 2" F. The screw 2' is used not onlyas a regulating device to adjust the position of the lever f, but italso constitutes a guide for such lever, keeping it always in a trueposition under the knuckle g. That is to say, the screw will prevent thelever from turning or twisting to either side either by the warping ofthe wood or by imperfect or worn-out centers, and thus avoids frictionalcontact between the jack and the inner sides of the slot f through whichit passes.

j is a bent spring that engages both the lever f and the jack 1). Thisspring is connected at j to the lever f, thence passes along the upperside of such lever around a pinj of rider a, and thence along the upperside of the rider to the jack. Thus it will be seen that the spring isreadily accessible and can be regulated with great facility. Moreover,the spring is of such agreat length that it is of superior resiliency,is not apt to strain or wear out, and that it imparts a superiorelasticity to the touch.

\Vhat I claim is 1. In an action for grand pianos, the conibination of arider with an outwardly-bulged repeating-lever pivotally connected tosaid rider, substantially as specified.

2. In an action for grand pianos, the combination of a rider with anoutwardly-bulged and slotted repeating-lever, and with aregulating-screw that extends through said lever, substantially asspecified.

In an action for grand pianos, the combination of a rider with apostprojecting upwardly therefrom, a screw engaging said post, and anoutwardly-bulged repeating-lever engaged by the screw, substantially asspecified.

a. In an action for grand pianos, the con1- binati on of a jack an drider with an outwardly-bulged repeating-lever pivoted to the rider, andwith a bent spring engaging the re peating-lever and the jack,substantially as specified.

5. In an action for grand pianos, the combination of a jack and rider,with an outwardly-bulged repeating-lever, a regulatingscrew engagingsaid lever, and a spring e11- gaging both said lever and the jacksubstantially as specified.

JOSEPH IIERRBURGER.

\Vitnesses A. WYK, A. GERVAIS.

